linux-kernel - Re: [PATCH 1/2] workqueue: Use normal rcu

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Message-ID: <20190321205935.7ndo5k5zumc77h37@linutronix.de>
Date:   Thu, 21 Mar 2019 21:59:35 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     linux-kernel@...r.kernel.org
Cc:     Tejun Heo <tj@...nel.org>, Lai Jiangshan <jiangshanlai@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 1/2] workqueue: Use normal rcu

On 2019-03-13 17:55:47 [+0100], To linux-kernel@...r.kernel.org wrote:
> From: Thomas Gleixner <tglx@...utronix.de>
> 
> There is no need for sched_rcu. The undocumented reason why sched_rcu
> is used is to avoid a few explicit rcu_read_lock()/unlock() pairs by
> the fact that sched_rcu reader side critical sections are also protected
> by preempt or irq disabled regions.
> 
> Replace rcu_read_lock_sched with rcu_read_lock and acquire the RCU lock
> where it is not yet explicit acquired. Replace local_irq_disable() with
> rcu_read_lock(). Update asserts.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> [bigeasy: mangle changelog a little]
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

A gentle ping.

Sebastian